The Under Armour Base 2.0 Womens Long Underwear Top turns up the heat when the temps drop. The Light-weight with thermal-grid fabric keeps body heat in while transporting moisture out. Let yourself enjoy the outdoors - you will be reassured that you will stay toasty warm. This soft crew also neutralizes odor with Under Armour's Anti-Odor technology while the smooth Flatlock Seams deliver chafe-free comfort.